i think we are talking about different thing, however
4byte = 00 00 00 00
4byte = T E X T
this is clear.
next there are 4bytes (???) and then 4bytes (msg file length).
after this, there are groups of 4byte, pointing to entrytext.
in this example the unknow value is 0432000.
if you analize the file as i said, you can see that "header" (as i definited) length is 0x324.
if i analize as you said 0432 is a number of entry and 0000 is a unknow value (unused), right?